Projectiles spawning but not moving.

i'm trying to shoot a cannon upon pressing the space key. This is my code, i'm not entirely sure why this isnt working as i have it working on a similar way elsewhere. With the current code it will spawn a missile, but just where the tank is, and not propelling forward.

tank2.addEventListener(Event.ENTER_FRAME, controlGuns);

addEventListener(Event.ENTER_FRAME, gameUpdate);

stage.addEventListener(KeyboardEvent.KEY_DOWN, shootGuns);

addEventListener(Event.ENTER_FRAME, moveMissiles);

stage.focus = stage;

var missileCounts = 0;

function controlGuns(evt: Event) { //Control the gun on only the X axis.

tank2.x = mouseX;

}

function shootGuns(evt: KeyboardEvent) { //Shoot the gun using a switch statement

switch (evt.keyCode) {

case Keyboard.SPACE:

var newMissiles = root["missile" + missileCounts] = this.addChild(new Missile());

newMissiles.x = tank2.x;

newMissiles.y = tank2.y;

newMissiles.width = 15;

newMissiles.height = 15;

var cannonSounds = new CannonSound(); //When shooting, play the audio file

break;

}

}

function moveMissiles(evt: Event) {

for (var i = 1; i <= missileCounts; i++) { //Allow each individual missile to detect if it has hit the ship

root["missile" + i].y += -25;

if (root["missile" + i].hitTestObject(shipArray)) {

}

}

}